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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef65c007dfa698adeb61943af838b1f214d43ff8c2400a2889d9d96b74f9afa9' 
  AND token = 't+FkBOf53f2jAMIO8Hd+VXk/eURd/mU638uPZjp0Oao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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