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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14babe9b7612668ef872f932efca87decbbcd97dedb8917eabf7dc05e3e8a9b4' 
  AND token = '1Q/FAndpnfUfh2LyJ581jEk78lJUo7Y/3VLAewCnpqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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