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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f096f9ed3249543159d9b5b043ee7d2b4b2e29b10f6a88a7802962de5e02a94f' 
  AND token = 'TA5OPrGrr9rU6przTzrLLW5GGahrE7SWfiwuUqu1Ehc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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