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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83522814349199aa98b264c4e6c4bb0bf83d604209662ddfeef6834207d9adf9' 
  AND token = '4NRSX1RsdcFvHNRRcCLfOpD5tawU/cHSuJj8+Ysf+Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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