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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f1f549779453040a2e8f0e0860378bc58aa9e81406c73276183ea4a9ffed8d' 
  AND token = 'WtNh7DY4lE/G3f/Xx7uLxfjdR/+GEuGkx52IWL/W5j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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