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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afba414df5b35932d29666317206ce35b42b39bc8736ba75c17c529b6a2da9ef' 
  AND token = 'XL5SMQ0myPecMd4UtN+bxhaUl+FssmZTVrz/f3i2UG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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