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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689b3c13e1a235e3b5de92131cd4954fc0e4d61e2d37f6b05e276eed05ab27fb' 
  AND token = 'zZ2WFXETIlzaBFyBf3Mcnd2zZXWdAtnHkvSyu9A3FYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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