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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6213b95c1f6aeab1cbfb3d200264f28538dd4029d82e065b2e5a6a64e7569c' 
  AND token = '1vkLfT/4QTQjX9u81VnkdPHv8NXOBpZv2nW4fQx+3o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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