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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6982a4e0686ec3fbdf0ee225cde59d438a3a82f6bb7504e70d55d6b3121dcfb3' 
  AND token = 'uoCDGmO4ujVRoz+T8H67HkfvrXGeOL/L6wapigPasTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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