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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c637ffa7704aebe8f9753bc361588fac3d64c182c59f499d8543bb959a60f24e' 
  AND token = 'kZgH6HcZFC4p1UeB8vuJrdVk/ytBz9rFdN5zwv4yX/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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