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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c8c09bf00241507f4aeb078acd2da880f506bf3bb33bf22a67cb1096c52f98' 
  AND token = 'hscbeon6RN8p6LSC0gw++wW+FL31yahfhBd8IEjvc6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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