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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631b2430cb1d02b80830bb3cd9daeb23b47f24c99f8f8472817a26213ce277a6' 
  AND token = 'bwV6x4sBqV50eGduHoIECP1y9EJtkALrSfrRFub+FYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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