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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34228c3cb10d0089cbc6027bb9281a5410a69a4dfff91342f75980e6f35ebb82' 
  AND token = 't2Xz7Behim1ivcu3ThJcnJVcSmhNn8Jh4GjPeJpy05I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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