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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da725dcd643b9d003819342f0411a25816757408065704d8780b3a5ae3b4c75' 
  AND token = 'aB4LWiEWiOY3HtArmAePsi3NqWTd3UoE5T6kz8ojQV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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