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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b0697d54cc51d8eecd2539e1470cc14a2c286b87aa422d60315540caab2d76' 
  AND token = 'sMl0cz590LStnhApjXlfk6m0baQTR9KUC0s4mepi/M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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