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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83e83d09e7caf385bb08fd9df343d9310bfbc2b668b9a86e4a85761c73de005' 
  AND token = '4DjUBpGdg9dkhTiX82BJqIwUOidYTPvnFpe5cfGx1hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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