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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d75c39b1834a264ba484855ea26a11ea86b2a21909d15b7f3f0c22a1f7ed22' 
  AND token = 'H2SMYfFT8cquD35NlzAMHVFE/W9K5/NYyOW6mOkFzX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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