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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b973ee4427aeef783c8f61b0f8a26069e03aea51903b5653bc860ee8c3e3c4e0' 
  AND token = 'oX7RqNtzABHKR3STcbZ3e3hbfOnFQUm3r7QIe/9LAYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}