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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c168dad639f9bbb360cc78c4b5c370fa99e1f01b8d97a647c04c7dd5bf6e3ae' 
  AND token = 'PCqq8tUDgP37VEa89H1l4UxuUaeS43XCMKlcu8MIdiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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