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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a5d22fcdaaa028dffbddbd1c299097f4c479ca446ec73adbd8e761c8a83e78' 
  AND token = 'ExfBBBOk+IF2rrz5NhiaE7VykuVl8nj5hKHq4zjZ5n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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