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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadd36cd10e14006dfdc3c91eb48fa6e2a7f6a33374db0be5263b7d73436a8d3' 
  AND token = 'sWfmiDio79MIp8uGj2MERz0U3Qnu3HQwIg12nygjjxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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