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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fe9e22c634b5fe7557fe3869534a6e61c7e2bf4db2f9d4a8fb8fe04ac6353a' 
  AND token = 'fgdxN6lSHxxi752ox6Yohkk1AVE8ZuMdWfiEIOmUlY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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