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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc7adbb97720d3822377fe28f5161618e542ad612c8caf6ddf9902f3e0dc633' 
  AND token = 'u7s/etbRQETCnh1A22pisu6O/pHcmCMsCXXjRy96is4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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