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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90104a33269f08cfb7ed4e866cd4b954cc03add475d569712853dac9c1ff05f' 
  AND token = '+C73d2+QwzUO5fn/6/U5Xm3ZNN6wvLWpK0gn52HiUS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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