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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15217c7f8c593ea038f40aa6f2a3ec48db3cd143f457e84313e1133db86bee47' 
  AND token = '5xca0E3qtyq3ehr5Y4mGODG1WsWFhSe8PN03SKmZKWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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