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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c5fa3f5cad28655f39ed3a3f4437ccfddbd23e514c9359a3b5bd4958d7d73b' 
  AND token = 'pkPfm5/3nDaWjJ5ohM9b9Z7M26Ha6hgHk1wPWCGAGFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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