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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20981320b09ff85456a767b58629b192b1cbc560cfd2c0c2ee575219cfadd77' 
  AND token = '3yNMygwgtdwYY4t2N3ZGuNGzW+zKeCaDl/6BcMQE4xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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