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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8bde05ca3a4898ed43971ed2b0b3d080e5709b79134d4ceffed535fcc8c37e' 
  AND token = 'r0wvpX1fBZmoMmCO1C0J8wTQ+BOb87JueutNG/V0i+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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