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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bbb94d911bb955fa0bf2a6d2167972de6a6f3ffddceb2e9885ae19b27e1e6c' 
  AND token = '/b56xOkR8nXuM/MfJHb/xCi/tQFndfgVlfgoz//om4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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