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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb74fb86cfa8385ae9d80da557e3c3bc33681225ca2d25aa5de24bd517f99c02' 
  AND token = 'a8RBFWpkwb/hd6uzFnA8Gba7q8MP27gBkIr2l+3MrWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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