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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9873cf216e69a603ab40548613547d3a1daef57b1b878f2551a818e9e2fd03' 
  AND token = '6vo7baasQlO6bq/BLyq0GPswi5s6SphP3Tj6pGNFO5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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