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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc2b988a8043466959d7cfe81486dfe0afb18bf9f4822e61c5abfd275068935' 
  AND token = 'gUyUKHkmJNK9FvOZo+an+0Fk9jgitOD8lmzZa1fChJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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