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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd761f6d7babbe27fe0042a13d51015d1d0e483060009948500d2b40e9b8e85' 
  AND token = 'N4i8YydO2WRCF9/+RXrCV+dMrS81tX8aSSiMlbvU0Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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