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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87bc90d198c2b255fc05487911be17415f6dc093e4f00a8b0662b4ef3bfa1782' 
  AND token = '8XaUm0TzsPuoTiZnIV2n/MAr8QLjL6xEPGXdGI+/Br8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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