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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52293de97c05f9fd59214b8bd898bcc1548e618eec06114826280554e85ce4f' 
  AND token = '+x8LHGdBK1Ivz0cVYmlOlbqMk0HOHnWxEPyvr9qUBHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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