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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a04377875398719c69866cad067165ca9d1750eb9f6033b025def61a9508e5' 
  AND token = 'Lq+2k6WetfbmJRN920YBFcnP9JUfgZ20Q29jx1C2XmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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