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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cae59d20daedd8c6ab93812646f471c2e4d2e65656dd319b01dea422b8181bd' 
  AND token = 'kjC8+l/wH3hUHk6CtHSR5xEoWOqlx5GG9l4uUUoD0w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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