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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdd9ebccb0d0c6a4cea3fd1fbac047fedc44b240b2315cc9601de075054c9a2' 
  AND token = 'WSWejaaoGJaER23DdxxNfPWFn90RjUgKGwZIq7/F9PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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