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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af6774ac5c7dadddd7bc7635fbd7b4e9599a2452cdc17b9cef1dec062761ef1' 
  AND token = '+UwFIfuTl93MonAPSP+duxU6hRJjJyD4RbCkSSy62yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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