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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a598d58c647613c2a0dd8dcc609ea6cdb7252bc2d5f033a272d603139ff68857' 
  AND token = 'TXy6Mbncpx6AhKxyWZmIANrWIK4x6Xi/4HIoH0AojOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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