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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142f75b3871f1d01fe0478a3a551bc98064bf9330630183b6b1e5a4bff4fdfe5' 
  AND token = 'PNdNdTi2DBsmZOM13hwWzLqKUNCKQLIR3YarmkhmtCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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