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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6123603b767ca5be86584a6ba88facb984e0599172794b2618d6b21b3c4b9ab' 
  AND token = '8r3kqnqzASV9FGzt05yLopY3m+urEBbNSGsIWmIQqKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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