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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fbbd4a5ee901921f104f63e09d3a62005a5d484511632ca1ff12ac574b0bd4' 
  AND token = 'JLDx019QZcjqGo+hF9wGI3nLltJnWjw5GyWdIreEbNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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