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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83165ce0354e2441785cfc0f9228967126a12f1b62cde15d314826052d70ef51' 
  AND token = '7PYUUp2Xanv6hfKDpNioM1957QOLFD2oPBfm+lTsyFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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