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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922c3dcbb9452907dfd5d8979094a74c1ccc32f8df855ab6743db27a078654de' 
  AND token = '6F7uX/k8TqN4ZRJwL1AzbuvAA/wer44oS7I5ADvGrl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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