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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8872ab1ebc2b7012f37617b4435a6566cb31438d2729bb03987d38f0b16bb7' 
  AND token = 'y9a7wcZV5yWAej2Vb/Snq05hXUTwPDSwUHZ0NlTKpWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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