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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b8d60ab6094b9b850aa98c79479aeabbbea0dedeea692c3dfe4e7e492d745e' 
  AND token = 'Du96vgMpU7SgvVJTVb0KCsDy068jIxss6yQamt1qv5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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