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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bdc10426c604cdaaf6558bd5b14e00a69c508a6df9c76c264454aba6c093fc' 
  AND token = 've2WMGZ77HWjDAg/dda3zuNew+ZC3H/Prm0tFhjt+k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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