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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d579b00dcbebda46c8eccd691bec9c5323dec3961a37f16dadc97625fa59bfa' 
  AND token = 'nQAGSoP2UjC2leUpXnO8J0i+BpbF1cstOkIiL6GmcMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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