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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55072fc00d2a349a1317e4f0caceb1174bab2a7d1e69f8710f44782062dd47e9' 
  AND token = 'I3flssHA1X9veEyGOW9LNo86phRnM9FqcVzXkpK+MPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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