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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cda2e4f27beda53cb3045a36035564a2919dc4d25b11f5bcd7a4ea5d7af7cd2' 
  AND token = 'Uweu0P6+24B7O8sbU7j/oWDNleu0v2/aINuMgxh7SrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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